portable oxygen concentrator 5 settings 90% purity

 Flow Settings 1 - 5 settings equal to 1-5LPM flow Oxygen Concentrations 90%+5%/-3% at any settings Outlet Pressure 8.5 PSI Sound Level ≤ 40 dB (nominal) at flat table, ≤45dB when travelling. Size 9.1 in x 8.7 in x 12.8 in (23 cm x 22 cm x 32.5 cm) Weight 11.5 lbs (5.2kg) Machine only, 13.7lbs(6.2kg) with battery Remote controller Wireless, 10 meters circle through the walls User Interface Push buttons, back-lit liquid crystal display (LCD) Filtration air inlet filter, bacteria filter Operational Temperature 41° to 104°F (5° to 40°C) Relative Humidity 15 to 95% Altitude Up to 12,000 ft (3657m) Storage Temperature -4° to 140°F (-20° to 60°C) unit only Relative Storage Humidity Up to 95%, non condensing Power Consumption 90W~100W AC Power Input 100 to 240 VAC, 50/60 Hz, 1.8 A max AC Power Output 14.8 VDC, 8 A max DC Power Input Input 11. to 16.8 VDC 20 A max DC Power Output 14.8 VDC, 8 A max Chemistry of Battery Lithium Ion 14.8 VDC (nominal) Battery Dimensions 6.1 in x 3.4 in x 2 in(15.5 cm x 8.5 cm x 5 cm) Battery Charge Time Approximately 4 to 5 hours Battery Duration Two hours minutes at 1-5 any settings, extra battery is optional. O 2 concentration indicator Green Light=Normal, Yellow=Caution <82%, Red with Audible Alarm=Warning <75%